If the CMRR of the Op-amp is 60 dB, then magnitude of the

V_– =	R	. 2 = 1 V
	R + R

V₊ =	R	. 2 = 1 V
	R + R

V_d = V₊ – V_– = 0
given that
CMRR = 60 dB

60 = 20 log₁₀		A_dM
		A_CM

= 20 log₁₀ Ad – 20 log₁₀ A_c
60 = 0 – 20 log₁₀ A_c
or 3 = – log₁₀ A_c
or A_c = 10^{– 3} = 0.001

or V_o = A_CM.		V₊ + V_–
		2

= 0.001		1 + 1
		2

= 0.001 = 1 mV